+++ /dev/null
-//----------------------------------------------------------------
-// Copyright (c) Microsoft Corporation. All rights reserved.
-//----------------------------------------------------------------
-
-namespace System.Activities.Presentation.View
-{
- using System.Collections.Generic;
- using System.Diagnostics.CodeAnalysis;
- using System.Xaml;
- using System.Activities.Presentation.Model;
- using System.Runtime;
-
- //ViewState is stored as a Dictionary<string, object> on the CFx object.
- //ModelItem is passed in StoreViewState to get a handle to the CFx object.
- [Fx.Tag.XamlVisible(false)]
- public class WorkflowViewStateService : ViewStateService
- {
- EditingContext context;
-
- public override event ViewStateChangedEventHandler ViewStateChanged;
-
- public override event ViewStateChangedEventHandler UndoableViewStateChanged;
-
- [SuppressMessage(FxCop.Category.Security, FxCop.Rule.DoNotDeclareReadOnlyMutableReferenceTypes)]
- public static readonly AttachableMemberIdentifier ViewStateName = new AttachableMemberIdentifier(typeof(WorkflowViewStateService), "ViewState");
-
- UndoEngine UndoEngine
- {
- get
- {
- return this.context.Services.GetService<UndoEngine>();
- }
- }
-
- public WorkflowViewStateService(EditingContext context)
- {
- this.context = context;
- }
-
- public static Dictionary<string, object> GetViewState(object instance)
- {
- if (instance == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("instance"));
- }
- Dictionary<string, object> viewState;
- AttachablePropertyServices.TryGetProperty(instance, ViewStateName, out viewState);
- return viewState;
- }
-
- public static void SetViewState(object instance, Dictionary<string, object> value)
- {
- if (instance == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("instance"));
- }
- AttachablePropertyServices.SetProperty(instance, ViewStateName, value);
- }
-
-
- public override object RetrieveViewState(ModelItem modelItem, string key)
- {
- if (modelItem == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("modelItem"));
- }
- if (key == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("key"));
- }
-
- object viewStateObj = null;
- Dictionary<string, object> viewState = WorkflowViewStateService.GetViewState(modelItem.GetCurrentValue());
- if (viewState != null)
- {
- viewState.TryGetValue(key, out viewStateObj);
- }
- return viewStateObj;
- }
-
- public override void StoreViewState(ModelItem modelItem, string key, object value)
- {
- if (modelItem == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("modelItem"));
- }
- if (key == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("key"));
- }
-
- object oldValue = null;
- Dictionary<string, object> viewState = WorkflowViewStateService.GetViewState(modelItem.GetCurrentValue());
- if (viewState == null)
- {
- viewState = new Dictionary<string, object>();
- WorkflowViewStateService.SetViewState(modelItem.GetCurrentValue(), viewState);
- }
- viewState.TryGetValue(key, out oldValue);
- if (value != null)
- {
- viewState[key] = value;
- }
- else
- {
- RemoveViewState(modelItem, key);
- }
- if (this.ViewStateChanged != null && value != oldValue)
- {
- this.ViewStateChanged(this, new ViewStateChangedEventArgs(modelItem, key, value, oldValue));
- }
- }
-
- public override bool RemoveViewState(ModelItem modelItem, string key)
- {
- if (modelItem == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("modelItem"));
- }
- if (key == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("key"));
- }
- bool itemRemoved = false;
- Dictionary<string, object> viewState = WorkflowViewStateService.GetViewState(modelItem.GetCurrentValue());
- if (viewState != null && key != null && viewState.ContainsKey(key))
- {
- itemRemoved = viewState.Remove(key);
- if (viewState.Keys.Count == 0)
- {
- AttachablePropertyServices.RemoveProperty(modelItem.GetCurrentValue(), ViewStateName);
- }
- }
- return itemRemoved;
- }
-
- public override Dictionary<string, object> RetrieveAllViewState(ModelItem modelItem)
- {
- if (modelItem == null)
- {
- throw FxTrace.Exception.AsError(new ArgumentNullException("modelItem"));
- }
- return WorkflowViewStateService.GetViewState(modelItem.GetCurrentValue());
- }
-
-
- public override void StoreViewStateWithUndo(ModelItem modelItem, string key, object value)
- {
- object oldValue = RetrieveViewState(modelItem, key);
- ViewStateChange vsChange = new ViewStateChange(this)
- {
- Item = modelItem,
- Key = key,
- OldValue = oldValue,
- NewValue = value,
- };
- ModelTreeManager modelTreeManager = this.context.Services.GetService<ModelTreeManager>();
- if (modelTreeManager != null)
- {
- modelTreeManager.AddToCurrentEditingScope(vsChange);
- }
- }
-
-
- void RaiseUndoableViewStateChangedEvent(ModelItem modelItem, string key, object newValue, object oldValue)
- {
- if (this.UndoableViewStateChanged != null)
- {
- this.UndoableViewStateChanged(this, new ViewStateChangedEventArgs(modelItem, key, newValue, oldValue));
- }
- }
-
-
- internal class ViewStateChange : Change
- {
- protected WorkflowViewStateService viewStateService;
-
- public ModelItem Item { get; set; }
- public string Key { get; set; }
- public object OldValue { get; set; }
- public object NewValue { get; set; }
-
- public ViewStateChange(WorkflowViewStateService viewStateService)
- {
- this.viewStateService = viewStateService;
- }
-
-
- public override string Description
- {
- get { return SR.ViewStateUndoUnitDescription; }
- }
-
- public override bool Apply()
- {
- viewStateService.StoreViewState(Item, Key, NewValue);
- this.viewStateService.RaiseUndoableViewStateChangedEvent(Item, Key, NewValue, OldValue);
- return true;
- }
-
- public override Change GetInverse()
- {
- return new ViewStateChange(this.viewStateService)
- {
- Item = this.Item,
- Key = this.Key,
- OldValue = this.NewValue,
- NewValue = this.OldValue
- };
- }
- }
-
-
- }
-
-}
projects / mono.git / blobdiff